1. Thermal Shock Resistance - Tests are run by quenching samples into water from various elevated temperatures. The change in temperature where a sharp decrease in flexual strength is observed is listed as DTc.

2. Wear Reistance - Impingement tests are run using a dry fused alumina abrasive. Rubbing tests are run using a dry 240 grit fused alumina abrasive. The indices in the chart are calculated by dividing the material volume loss by the volume loss of an AD-85 alumina control. The lower in the index, the better the wear resistance.

*Ceramic property values vary somewhat with method of manufacture, size, and shape of part. Close control of values of most properties can maintained if specified.